This report is one of a series that presents strength properties of materials designed to endure elevated temperatures. Strength properties and strength-exposure curves are given for an epoxy resin laminate with ERSB-0111 resin in conjunction with 181-S-HTS glass fabric. The data show the effects of temperature between 80 and 1,000 F., and exposure periods between 0.05 and 1,000 hours on the individual strength properties. The magnitude of the various effects may be judged separately. In general, the data show that all mechanical strengths, except tension at 0 F, decrease uniformly with increases in temperatures of short duration. The tensile strength remained relatively high until a critical exposure was reached and then displayed erratic characteristics. Other mechanical strengths above 400 F. decreased with increased exposure but peaked at about 100 hours.